Preparation and characterization of electrodeposited Bi2Se3 thin films

Effect of Substrate on the Structure and Thermoelectric Properties of n-Type Bi2Te3−y Se y Thin Films Prepared by Electrodeposition

“…Furthermore, pink deposits were firstly observed in the scanning process from opencircuit potential to C1 on the Au and Bi electrodes, which were subsequently converted to dark deposits on scanning from C1 to C2, revealing that deposition of Bi 2 Se 3 occurs at more positive potentials compared with Bi 2 Te 3 , as reported in the literature. 24 Therefore, according to this phenomenon and previous work, 19,24,25 peak C1 is related to adsorption and reduction of H 2 SeO 3 , and peak C2 is related to formation of Bi 2 Te 3Ày Se y . The absence of peak C1 and the lack of an obvious color change (pink to dark) during the cathodic scanning process on the Bi 2 Te 3Ày Se y electrode indicate that adsorption of H 2 SeO 3 onto the Bi 2 Te 3Ày Se y substrate is more difficult than onto the other two substrates.…”

Evidence for topological surface states in epitaxial Bi 2 Se 3 thin film grown by pulsed laser deposition through magneto-transport measurements

“…It is known that the direct probing of the topological nature by magneto-transport remains a major challenge [9][10][11] since it is a bulk sensitive experiment. Even small imperfections in the near-stoichiometric crystals will lead to metallic behavior in the bulk and thus overwhelm or mask the surface contribution [51].…”

“…Several techniques have effectively prepared Bi 2 Se 3 thin films, including eletrodeposition [11], solvo-thermalization [12] and thermal evaporation [13]; these approaches produce polycrystalline films suitable for thermoelectric studies but not for TI-based integrated solid state devices. Most high quality epitaxial Bi 2 Se 3 thin films have been grown by molecular beam epitaxy (MBE) [14][15][16].…”

Direct Electrodeposition of Highly Dense 50 nm Bi2Te3-ySey Nanowire Arrays

“…5 The shift of the reduction potentials to more positive values upon addition of H 2 SeO 3 is consistent with previous reports that the deposition of Bi 2 Se 3 occurs at more positive potentials compared with Bi 2 Te 3 . 13 The observation of a reduction potential between Bi 2 Te 3 and Bi 2 Se 3 implies formation of a single phase with a reduction potential that is between the reduction potentials of the binary alloys.…”